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Hi all looking for any advice please. I have an old 80s barcrest machine that when you swith it on nothing happens except some buzzing through the speaker. I have put the power supply and mpu4 board into another machine and both work with no problems so now stuck for ideas. Any help would be very much appreciated. Thanks

I lifted pin12 out the socket but it reads the same! maybe this chip is bad too?

So I'm seeing the 100hz signal into IC18 pin 13 with the pattern you mentioned but pin 12 as in the scope pic above, so I pulled IC18 and replaced with a used chip which was in a socket, it passes the vector test on my programmer? Anyway the results are the same with this used chip fitted! I was convinced this was the culprit! Thanks Ronnie

Hi, You won't find much emulation here. This is mainly about real fruit machines from the 60's-80's The main site for emulation is www.desertislandfruits.com. Post an introductory post over there to get started.

Hey everyone! Im Huuj! Im new here, i dabbled at emulation in the past about 12 years ago or so!

Thanks so much Bob that gives me something to go at. Most of the stuff in the ram area has aleady been replaced and the ram was swapped out to rule that out. And for being a pro lol well I wish

It could be, on pin 13 there should be a double half wave 100Hz about 3-4v pp and then a nice chunky square wave out of 12. I've had various faults here IC18, R85 and broken track between the big diodes and R85. Could be anything really but easy to locate. If any of those components above look corroded I just change them all. The vbatt (not actually called that in MPU3) is the voltage to the RAM and battery charger. As long as you have 5v at the collector of T61 you should be OK. I usually change all the components around the battery area as most times they all show green legs. Saves a lot of time looking for faulty bits that you're probably going to have to change anyway. I reckon you'll be senior pro MPU3 fault finder before too long Ronnie.

Is it likely IC18 is bad? or something else prior on pin 13? Thanks Ronnie

Thanks Bob, ic18 pin 12 does not Look too clever assuming I have the scope set right? vbat is that the charging volts for battery? cheers Ronnie

Have you checked the 100Hz is OK? IC18 pin 12 should be a nice square wave. Other than that is the RAM good? Vbatt OK?

Jackpot Multiplier is a late 1970s, 2p play, electro mechanical conversion on what would have originally started as a Bell Fruit Ten Up electro The conversion build was by a company called ADMC or Automatic Development Manufacturing Company LTD who were based in Nottingham back in that era. The cabinet corner looks a bit battered but if it's complete inside and not been tampered with, then there is no reason why it should not restore and run again. Having said that, It looks like it's been stood for sometime and many of the timers could be jammed or seized so don't expect it run well if at all when plugged in. As it stands with the inner workings unseen so anything missing and it's spare parts so, About any offer up to £50.

Anything else I could look for whilst it's hooked up to a machine? stuck pia's etc? Thanks Ronnie

I've quit gambling a while back and sold / scrapped all my old machines but this looked like an interesting old thing that might be worth saving, even though I'm sure it'll be beyond me

I just solder bridged the key pins

old pc motherboards. ISA sockets is closest I can think of

I think I've got some of those but no keys!

Definitely electro! If the cabinet is good, it’s probably worth £60, these machines are quite fixable for sure!

Thanks Andrew maybe it would be worth isolating the switch matrix see if that lets it boot but I guess a pia will be involved with that thanks ronnie

'resetting' on a mpu4 i found is likely something wrong with the switch inputs, I had a cart that would do this on the test rig and never did work out which switches needed to be where on it for it to continue. perhaps its similar for mpu3

I bought some of these years ago correct length but keyed wrong I did manage to fit one to a board but the pins are about 2mm too short! This is how I lost the brackets! They would need modified as the connector is closer to the board , the pins can be removed to alter the key

Everything worth mentioning Bob for sure, yes it's an LS712 for IC24

Just a thought, what mod board is it? The early ones won't run the later games. Easy way to tell is if it's got a 74LS03 for IC24. I suspect you probably know this already but in for a penny....

Well it appears to work just fine so I'm well chuffed. All I need to do now is to find a source for the connector. Hens teeth would be easier especially as it needs the little spacer in the right place. Luckily I did have a strip of it but had to cut it both ends as the spacer was in the wrong place. That was my last piece too. If anyone knows a source I'm all ears. (brackets as well)

Hi all, I've blocked all fruit machine sales pages recently but this has been shoved in my face by Facebook as it's just on a general page, not a fruit machine one. I've no idea what it is. It's before my time and no idea if it's electromechanical, microprocessor based, or even who is it made by! Any ideas? Would it be worthwhile picking it up even if just for a project I'll never complete? Seller asking £60 which seems a bit much for what is 99.9% likely a non-worker. Ta!

Brilliant Bob, I have a board that I lost this and the 2 metal brackets either end! I found this plastic bit but the holes are cracked around where it screws on. God knows where the brackets went